Given two opportunities to pump funding into Colorado’s congested and cracking transportation system, voters passed on both Tuesday, leaving the state still searching in vain for a new source of revenue for highways and transit. Statewide voters rejected Proposition 110 — a 0.62-cent, 20-year sales-tax hike that would have produced nearly $22 billion in revenues and funded repayment of a $6 billion bond issue for state highway expansion — by a margin of roughly 60 percent to 40 percent.